The Growth of bone in diameter is called appositional
growth.
This type of growth occur in through out the life.
The osteoblast in the perisoteum deposit new bone matrix layers
onto already formed layers of outer surface of bone.
At the same time osteoclast on the ednometrium break bone
tissue down.This result in greater concentration of bone more being
built rather than destroyed , which produces thicker and stronger
bone.
This type of growth is developed in response to increased
stress from muscle activity or to weight.
Growth of bone in length is called interstitial growth , which
is required to increase in height .